Our system jacket and components give you more options to shield you from the elements in every season, climate and condition. Our antistatic, anti-pill ThermaCheck® 200 fleece jacket can be worn alone or zips into the system shell for an additional layer of warmth.NOTE: Please order all pieces of the system in the same size to ensure a correct fit. The system will only work if every component is the same size. For example, a medium liner will only zip into a medium shell.